If you're looking to give CyanogenMod 9.1 a go, you'll find something new built into the ROM's. As noted on the CyanogenMod blog, CyanogenMod 9.1 compatible devices with NFC will bring integration with Tapp powered by SimplyTapp. The joint partnership was born back at the beginning of CyanogenMod 9 and is now being introduced to allow payments from your smartphone with just a tap:

To Sign-up – flash CM9.1 on your NFC capable device, and get the Tapp app

Costs – It is between $0 and $5 to get an NFC card. That all depends on the card or cards you select.

Cards supported – At the moment you can sign up for a Tapp Anywhere Card (like a gift card with a fixed balance), CyanogenMod Tapp Card (Reloadable), as well as various store cards (depending on location).

Security – Card credentials are stored in the cloud and enabled to the point-of-sale via standard security mechanisms. By evolving from the plastic card model, this keeps your credentials (aka payment information) secure, accessible by only you, and only when you need them.

Supported devices include Galaxy Nexus, Nexus S (4G), Samsung Galaxy S2 and pretty much any other devices supported by CyanogenMod 9.1 with NFC. Stable builds of CyanogenMod 9.1 are rolling out right now, so if you're interested in learning more about SimplyTapp or testing out CyanogenMod 9.1, you'll find the links below.

still doesnt work for me. i wonder if i change that id thing to gt-19100 if that will work. i remember the very first jb preview for my phone had to be tricked into thinking it was the 9100. i will head over to xda at some point and ask. seems like if that did work... everyone would be doing it.